Lathe dog



Sept. 30 1924. 1,510,141

T. FISH LATHE DOG 1 Filed April 6, 1922 INVENTO/i A TTOHNEYS Patented Sept. 30, 1924.

UNITED STATES THOMAS FISH, F BRIDGEPORT, CONNECTICUT.

LATHE DOG.

Application filed April 6,

To all whom it may concern:

Be it known that I, THoMAs Fisni. a citizen of the United States, residing at Bridgeport, in the county of Fairfield'and State of Connecticut, have invented certain new and useful Improvements in Lathe Dogs. of which the following is a specification.

My invention relates to a new and improved form of lathe-dog. Lathe-dogs, that is, devices used with lathes for conn cting the work to the face plate have been known for many years.

One of the objects of my invention is to devise a lathe-dog which will not injure the hands of the operator.

Another object of my invention is to provide a protectedlathe-dog which shall prevent the clothing of the operator from being. caught by any part thereof.

Another object of my invention is to provide a lathe-dog which can be made up in small sizes. and which shall be well balanced so as to enable proper running of the lathe or grinding machine and which can be used in both devices.

Other objects of my invention will be set forth in the following description. and drawings which illustrate a preferred entibodiment thereof.

" Fig. 1 is a side view.

Fig. 2 is an edge view. The lathe dog has the usual ring 1 provided with the well known clamping screw 2 which is threaded. through the projection 6. The screw 2 has the head 3. The ring 1 is connected to the protecting arm 4 and this, as can be clearly seen in Fig. 2, projects above the head 3 of the screw 2. As can be clearly seen in Fig. 2, the arm or tail 4 substantially covers the projection 6. the screw 2 and the head 3. The edge of the arm 4.- merges into a long are of very small curvature which preferably begins a little below the top of projection 6, but extends above the bottom of the said pr0jection 6. The said are extends substantially to the stem 5 which is adapted to engage the face plate of the machine and revolve the dog and hence actuate the work piece.

It is to be noted that the end of the arm 4 is about the same distance from the center of the ring 1 as the stem 5. The weight of 1922. Serial No. 550,008.

the stem 5 is partially compensated for by the screw 2 and the head 3 so that the docis well balanced with respect to the center of the ring 1 and the center of mass thereof is substantially at the said center of the ring 1.

In using the device, it is connected to the work in the well known manner. The arm 4: is in advance of the screw 2 with respect. to the direction of revolution.

It is obvious that the hands or clothing of the operator cannot be injured by the screw 2 or head 3 since this is prevented by arm 4 and it is also obvious that since the device is well balanced that a very important improvement has been made the advantages of which are particularly important in small sizes.

The ring 1 is made integral with the arm 4 or separable therefrom.

I have shown a preferred embodiment of my invention but it is clear that numerous changes and omissions can be made without departing from its spirit.

It is obvious that my structure can be very simply and cheaply manufactured be cause it consists of the ring portion 1, the bar-like tail 4]: which serves as a guard for the screw and the screw head, the said ring having an extension on the side which is opposite the member 4:, which extension serves to support the tail piece 5. Hence the screw head 3 can be very easily manipulated and the parts are perfectly balanced at all times.

I claim A lathe dog having a ring portion pro vided with a set screw. said ring portion being associated with a bar-like member extending symmetrically on both sides of said ring portion, one part of said bar-like mem ber projecting above the set screw and the head. thereof and serving to laterally guard the same, the other part of said bar-like member having the stem of the said dog connected thereto, the said stem and the said screw being on opposite sides of the central portion of the said ring.

In testimony whereof I hereunto affix my signature.

THOMAS FISH. 

